Throttle-valve.



J. S. CHAMBERS.

THROTTLE VA'LVE APPLlCATiON FILED OCT. 5. 1915.

Patented Aug. 1, 1916. '2 SHEETS-SHEET 1 J. SCCHAIMBERS.

THROTTLE VALVE.

APPLICATXON Flt ED OCT. 5. 1915.

. Patented Aug. 1,1916.

SHEETS-SHEET 2.

To all whom it may concern: I Be it known that 1, JOHN S. CHAMBERS,

a citizen of the United-States, residing at NewYork, in th'ecounty of New York and State of New York, have.invented certain JOHN s. CHAMBERS, or NEW YORK, N, 'Y., ASSIGNOR 'ro CHAMBERS VALVE COMPANY,

A CORPORATION or NEW YORK. 1 r y new and useful Improvements in T hrottle- Valves, of which the follow ng sa speci iication. w I

This invention relates to throttles, and particularly to throttles adapted. for use on.

steam locomotives. v v One of the objects of the present inven tion is to provide a simple and practical throttle of the above character having few' parts which will be cheap to manufacture andlinstall. I I I i Another object is to pro'vlde a throttle 1n which the parts are so positioned and arranged as to permit of. ready renewal or replacement as may be necessary A further. object is to provlde a'throttle particularly adapted for use in modern loco-v motives which will be reliable and efficient in useand operation. 7

Other objects will be in part obvious and in party hereinafter pointed out.

. fWith these and other objects in View the invention consists in certain features of constijiction, combination of elements and, ar-

rangement of parts, the preferred form of; which will be first described in connection" with the accompanying drawings and then the invention particularly pointed out vin the appended claims.

'Beferring to -'the' drawings, wherein. the same part. is designated by thejsame. referencenuniera'l Wherever it occurs, Figure 1 is a-longitudlnal view, with certaln partsm section, showing therear portion of alocov motive boiler with my improved throttle I valve and actuating rnechanism applied thereto; Fig; 2 is an enlarged, sectional plan viewof a portionjof' the actuating mechanism; Fig. 5 is an enlarged vertical sectional view of the throttle valve in closed position;

and Fig. 4 is a'sir'nilar view withthe'parts in drifting.position} a.

made with the maximum sized boiler. "it: has become necessary to-reduce the size ofthe] steam dome and other upwardlyprojecting parts in order to maintain the total height of the locomotive within proper limits. The; reduction in-heightof the steam dome has struction.

Patented Au -.1, isle.

, caused certain objections and inconveniences to arise in properly poslt'i'oni'ng' the throttle therein ashes heretofore been customary.-

but alsoto overcome certain objections incitiyel'y; smallsteam dome or, if desired, to dispense with the dome entirely. 7 Referring. to the drawings in detail and more particularly to, Fig. 1,10 denotes the rear portion of theboiler' shell provided with a steam space or dome 11 and rear wall The present inventionis designed not only to accomplish the objects above set forth,

'dent to'installing athrottlewithin a rela sitioned an open ended dry pipe 14 extendmg downwardly to anelbow l5 and thence forwardly to a throttle box 16v containing a throttle valve, which will hereinafter be de scribed in detail. On the opposite side of the throttle is a second elbow 17 and a we tinuation 18 of the dry pipe which leads forwardly to the superheaterQ01?v cylinders, the case maybe. 'It is, of course, to be understood that the various parts f thedry pipe are'connected and supported in any desired manner and it is believed to be unneeesfsary to go into the details of their con- The-throttle, which is shown more clearly 'in; Figs. 3' and 4, comprisesthe throttle box 1(' riveted or otherwise suitably secured, in an opening in the upper partof the shell 10 by means of rivets or fastening devices pass ing' through holes 20 An opening 21 at the right 0f Fig.3. -com nunicates with the portion 15 of thefdry pipewhile another opening 22 in the lower part communicates with the part 18:01: the dry pipe, the inter-1 vening throttle valve being adapted to con-' trol-the passage of steam' from one partto the other. The upper part "of the throttle box 16 is provided with an annular shoulder 23 upon which rests a casting or housing 24 containing part of the actuating mechanisini This housing is secured to the-throt th box by means of a plurality of threaded bolts 25 passing through an apertured collar-26 of the housing and engaging tappedrecesses inthe throttle box. These recesses.

inflthepresent embodiment are six in numts: fendare equally spaced one from v another. thereby to permit the housing 2% to be placed in any one of several. positions as maybe desired and as will. be hereinafter more fully explained. The lower part of the throtie box is also provided with an annular shoulder 27 within whichlits a loosely inountedvalve seat or ring 2a. -'lh'e term loosely is used to distinguish from a machine lit and the space between the ring 28 and throttle box 16 is somewhat exaggerated as shown in the drawings. One object of this loose fit is to permit slight move ment of the ring with respect to its (lo-acting valve ani allow uniform expansion under varying degrees of temperature; and to permit a taking up of the strain exerted thereon bythe steaniat high pressure. When the throttle is closed. the contact at the annular shoulder 27 sufficiently tight to prevent any material escape of steam therethrough. The throttle valve coacting with the valve seat ring 28 is t ie balanced piston type and con 1p e a main throttle valve member and a. too or auxiliary throttle valve member 51. T e main throttle valve menr bar is provide 'ith a packing ring 32 at its upper part sliding within the housing 2e and made as near steam tight as possible. ".llhe'auxiliary throttle valve member 31 is proviiile d with guides on its Web loosely fitting within the valve ring 28 as Well as an upwardly projecting annular part 34 adapted to have sliding movement within the lower part of the main throttle valve member 30. l Vithin the main throttle valve member 30 is positioned a relief valve 35 coacting with a central valve seat 36 integrally formed with the web of the main throttle valve member. A plurality of holes or perforations 37 are provided in the bearing'wall 38 of the main throttle valve member which surrounds the actuating member or stem 40 and other holes all are also provided in that portion of the auxiliary valve member 3.1 immediately above the seating portion. The lower part of the actuating stem 4.0 is providedivith a washer 42 held in adjusted position by means of a nut 43. The upper part of the stem is connected by means of a pivotally attached link 41% with a crank arm 45 mounted at one end of a rock shaft 46 which is adapted to be oscillated from the cab by means of any desired mechanism, but preferably of that type which will be hereinafter described in detail as the same is believed to possess certain obvious advantages. it will thus be seen that when the throttle valve is in closed position as shown in Fig. 3, steam will be positively prevented from passing through the opening 21 and then out through the opening 22 into the dry pipe 18. When. howeverpthe throttle is in drifting position (Fig. 4) as indicated by the dotted lines of the throttle lever in Fig. 1 the crank arm 45 will be messes raisedslightly or to that position shown Fig. 4. When moved to this position, washer 42 will first coact with and raise i downwardly projecting portion otthe bean ing 38. and thereby raise the main throttle valve member 30 upwardly a corresponding distance. This \vill'pern'iit steam to p between the (reacting portions of the valve members 30 and 31 throughthe holes ii and down through the web of the auxiliary valve member to the dry pipe 18. The amount o'l' steam allowed to escape in this manner is only suilicient to break the vacuum produced by the suction of the pistons within. the cylinders. it will also be noted that when the throttle valve is in the drifting position t relief valve carried by the stem it) raised from its coacting valve seat 36 and any steam which may have passed the pa o ing ring 32 into the housing is psi-mined.

to es ape throuigh this valve 3 5 and out through the ope ing 37 into the dry pipe or it no steam has had an opportunity enter the l'uiiusing past the packing ring. reverse may take place. thereby to eipiaiiso or balance the steam pressure upon the opposits sides of the piston 30.

The actuating mechanism for this throttle is shown more clearly in Figs. 1 and *2. The upper part of the housing- 24.- is provided with a Tmhaped hood 50, one part of which incloses the crank arm to and the laterals are open ended and internally threaded, as clearly shown in i ig. 2.

7 It the housing is put on the position shown, the rock shaft 46 extends outwardly from one of the open ended laterals and a plug 51 is threaded into the opposite one. If however, the casting; 24 should be turned through an angle of 180 or if for any reason, it is desired to actuate the throttle on the left hand side of the locomotive then the rock shaft would pass through the opposite end of the housing and the plug 51 be inserted at the other side. A tube 52 surrounds the rock sha ft lb and has a steam tight threaded connection with the coacting lateral at one end and a similar. connection 58 in one portimrof a clamp 54 mounted on the side of the boiler transversely opposite the throttle. The rorlr shaft 46 is provided with an integral collar tapered atone side and coactinp; with an asbestos or other suitable packing: ring held in place by a gland 57. The members 54 and 57 are held together by means'ot bolts The member 57 is also provided with a chamber at its outer side inclosin g packing material (l0 bearing against a flange '61 holding the packing; 56 in place. A metal block 62 coacts with. the packing 0 and holds the same in contact under the action of a coiled expansion spring {33 reacting against a h aid ()4 of the chamber. The outer end of the rock shaft 46 is provided with a downwardly extending crank arm 65 i which the outer end of an actuating rod 66 is secured. This rod 66 extends backwardly to the rear wall of the boiler where it is pivotally secured at the point 67 to throttle lever '68 which in turn is pivoted at the point 70- to the bracket 13 mounted upon the boiler. A locking segment 71 is provided on its lower side with teeth 72 co-acting with a locking dog 73 mounted upon the throttle lever and Inovedin-to and out of locking engagement by means of a latch lever 74 adjacent the throttle handle in the usual manner. The upper part of the segment 71 is provided with a single notch with which a detent or dog 75 is adapted to coact only when the throttleis in' drifting position; The engineer by means of this notch is able to know when the throttle is in this position.

' vThe dog 7 5 is, of'course, of such construction as to be snapped into and out ofthe notch without any material effort.

The operation and method of using a de When the throttle 'is absolutely closed no steam is permitted to pass from the boiler to the cylinders and the parts are in .the position shown in full lines in Figs. 1' and 3.

However, when the locomotiveis drifting, the throttle lever is moved to the dotted line.

' position in which the dog 75 engages the drifting notch in the throttle lever segmentthe throttle Valve itself is in the position shown. inFig; 4, thereby allowing a small amount of steam to pass through the throttle intothe drypipe 18 and thence to the cylinders.- This breaks the vacuum which would otherwise occur in the cylinders during-the reciprocation of the pistons. The pressure upon-the opposite sides ,of "thc main throttle valve member is also equalized by steam passing in ancl out ,ofthe openings 37 and valve as maybe necess, If the throttle valve is',,,opened to of t, e'stem willcoact wit thegbearo z 38. as well asthe central'po ion of the inixiliary throttle valve member gland raise both of them the desiredyainount, allowingthe steam to pass freely between-the valve seat 28 and the auxiliary valve member 31.

It is thus seen that the present invention provides a simple and practical throttle having few parts which will be cheap to manufacture and install. Access to the throttle valve may be easily obtained by simply loosening the screws 25 and removing the cast- 'ing 24; Both: throttle members and valve seat may then ,be'removcd, groundand re- The construction is reliable and efficient in use and operation and particularly adaptable for locomotives in which the boilers have reached the limit in height and size. In short the present inven- A brief state-f ment, however, issubstantially as follows:

ce position, the washer on the ,lower tion is believed to accomplish, among others, all of. the objects and advantages above set forth.

ter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

\Vhat I claim is:

. -1. The combination with a boiler having its shell,provided with an opening, of a throttle box within the boiler secured in the 2. The combination \vitha boiler having its shell provided with an opening, of a throttle box secured to tliellnner side of the shell and surrounding the opening, a dry &

pipe leading from the steam space of the:

boiler to the throttle box, a steam pipe lead ing from the throttle box, a housing,- means located .exteriorly of the shell to secure the housing to the box and throttle valve mechanism carried by the housing.

, ,3. The combination with a boiler having a shell provided with an opening, a throttle box within the boiler secured in the opening,

a dry pipe leading from the steainspaec of the boiler to the throttle box, a stean'i pipe leading from the throttle box, a housing extending exteriorlyof the shell adapted to close the throttle box, removable means located exteriorly ,,()f the shell to secure the housing to thebox, and throttle valve mechanism carried by the housing.

4t. lhe=combination with a boiler having a shell pi-"ovided with an opening, a throttle box within the boiler sccurcdin the opening, adry pipe leading from the steam space of the boiler'to the throttle box, a steam" pipe leading from the throttle ,box, a valve seat carried by the box, a housing, means-to secure the housing to the box, a valve carried by the housing and adapted to cotipera-te with the scat to close the throttle, andmeans mounted on the housing for operating said valve.

5. The combination with a boiler having a shell provided with an; opening, a throttle box within the boiler secured in the opening, a dry pipe leading from the' steam space of the boiler to the throttle box, a steam pipe leading from the throttle box, a housing outside the shell comprising aportion a'dapted to extend through the shell and seat in the box, means located" cxteriorly of the shell for securing the housing in position outlet opening, of a alve and throttle valve mechanism carried h; housing.

(Min. a throttle valve, the eoaibinaiicm with a throttle box having an inie'l, and an outlet opening, of a valve seat iocated between said openings, a. stenn meam; for: no cipi-oea cing said stem, :1 piston ioosely mounted on the stem, a valve face fornaed at one end of the pisfon, a hollow piston loose;

moved from its seat. on the box. a

7. In a throicle 'alve, the (.Olliiil'i'illilOil with a throttle box having an inlet and an seat ioea'ied he tweexrsaizl openings, a stem, means for eiproeating said stem a piston havii an or:- tended hub loosely moan ed on tin lean a hollow piston having a hob loosely? iiioinii d on the hub of' the first pishah 'ihe halt in": ihe first piston. eaten-(ling; beyond the hub of the second piston when the valve in closed position, means carried by the seem to engagethe hubs successively and reciprocate the pistons, said hollow ed to coiipe ate with the valve seat in the box at one end and said first piston being? adapt ed to cooperate with the second piston at the other end, a valve, formed on the hub of the first piston, a 'alve *arried by the stern adapted to' cooperate with said lash mentioned valve seat; said first. hob being provided with openings for "the passage of st 211D when the valve on the stem is raised from its seatsaid second piston being provided with openings in its periphery through which steam can pass when said pistons are separated, a shoulder carried by ihe stem and adapted to en age first the hub of the first piston to separate-said pistons and then engage. the hub of the, second pision lo raise it from its seat,

8. in a throttle valve, the eombinaizion avith a throttle 'alve box having an inlet.

and an outlet openin a vaive s at ioeated between said openings, a vz lve ada 'ited to cooperate with said valve seat, a second valve assoeiated with said first ialve. and adapted to be opened before said first valve is raised adaped to engage saiiil notch, said piston being adapb said valves sneeesslveiy, a so i lore): i on one edge of hand O']'1.\iid iaieh oarriee by have]? and adapted to en aoe notch n the oppesiteed deient carried by the l ing so positioned on 'ihe sector that's be e gaged by said detenn when ,th valve shail have posiiion.

in. a throttle valvmiho eon-ahin:5 with a. throttle valve hon having; an 1 and an oneiet opening", a valve seai; with said orne vaive ai iapted lie (I with said valve Sean a second naive eiaibefi wiibi aid first valve and adapted. openeih be said fires valve is re l see ,v ween openee'i to driii' 1 iii; t, a Brodie aeiaa vain-s siircessiiei-y, a seetoi' ioisaw teeth on one ed e said see-tor a h e; "inked engage .zrtoi, a d er and adapfieiji sa d noieh hiring; so i time it wili be l.- iiill m? i.

i seeond valve shai L I Liana? position,

in a ii'si'oitle valve; "the (a. with a fihi'oztie box having open 1' one of said openings, a another of said openings, mechanism mounted in said h w stein eonnvrted with said. aetaaiin nis1n..a valve on said saein, a pislior: member havingav valve seai; for said valve said member being iia'zsely moan upon said stem. and ai'laptei'i. ho poem 1% steam to pass through the hmse moo 3 in the housing, a thiril valve assmiaiml .ah the piston valve member and ada'pied to eo operate with said first named seat and i 1 'arried by iihe stein and adapted to with said piston valve member a third Yalvfi sueressive'iy whereby in i ation of the ihrofi-le valve siJeam pre a euimiiaiing in the lnmsinowill he before the third. valve is m ved.

in iesiiznoiqa whew i .a :2 X111) sign; in presemeof two witnesses. dU Hi. if). if

3., (Iowan; 

